1. A basic, essential, or primary question that forms the foundation of a discussion, inquiry, or field of study
The fundamental question in philosophy is 'What is the nature of reality?'
A questão fundamental na filosofia é 'Qual é a natureza da realidade?'
2. A core question that must be addressed before other matters can be resolved
Before proceeding, we need to answer the fundamental question of funding.
Antes de prosseguirmos, precisamos responder a questão fundamental do financiamento.